3480821721 has 32 divisors (see below), whose sum is σ = 5636373120. Its totient is φ = 2110059072.

The previous prime is 3480821719. The next prime is 3480821741. The reversal of 3480821721 is 1271280843.

3480821721 is a `hidden beast` number, since 3 + 480 + 8 + 2 + 172 + 1 = 666.

It is not a de Polignac number, because 3480821721 - 2¹ = 3480821719 is a prime.

It is a super-2 number, since 2×3480821721² = 24232239706770803682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3480821741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50490 + ... + 97523.

It is an arithmetic number, because the mean of its divisors is an integer number (176136660).

Almost surely, 2^3480821721 is an apocalyptic number.

It is an amenable number.

3480821721 is a deficient number, since it is larger than the sum of its proper divisors (2155551399).

3480821721 is a wasteful number, since it uses less digits than its factorization.

3480821721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148102 (or 148096 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 3480821721 is about 58998.4891416721. The cubic root of 3480821721 is about 1515.5162361890.

The spelling of 3480821721 in words is "three billion, four hundred eighty million, eight hundred twenty-one thousand, seven hundred twenty-one".